watchOS 7.3 includes new features, improvements, and bug fixes, including:
- Unity watch face— inspired by the colors of the Pan-African Flag, the shapes change throughout the day as you move creating a face that's unique to you
- Time to Walk for Apple Fitness+ subscribers— an audio experience in the Workout app where guests share inspiring stories as you walk
- ECG app on Apple Watch Series 4 or later in Japan, Mayotte, Philippines, and Thailand
- Irregular heart rhythm notifications in Japan, Mayotte, Philippines, Taiwan, and Thailand
- Fix for an issue where Control Center and Notification Center may be unresponsive when Zoom is enabled